Mosquito season in Cape Girardeau County, MO: when it starts and ends

Mosquito months in Cape Girardeau County

In a normal year mosquito season in Cape Girardeau County, MO starts around March 29 and ends around November 4, about 31 weeks.

1. Jan
2. Feb
3. Mar
4. Apr
5. May
6. Jun
7. Jul
8. Aug
9. Sep
10. Oct
11. Nov
12. Dec

What to do in Cape Girardeau County, and when

• Start tipping out standing water weekly by March 15.
• Book any yard treatment for late March, ahead of the July peak.
• Repellent can go away after November 4.
• 1 West Nile case since 2016 (last 2016): you should use repellent at dusk June to September, more so if over 60.

Cape Girardeau County against the rest of MO

Cape Girardeau County has the 22nd longest season of 115 MO counties, at 220 days against 242 in Pemiscot County and 187 in Crawford County. Its mean temperature is 56.9°F.

• Phelps County: March 28 to November 4 (220 days, 1 WNV)
• Reynolds County: March 28 to November 3 (220 days, 0 WNV)
• Vernon County: March 29 to November 4 (220 days, 2 WNV)
• Carter County: March 28 to November 2 (219 days, 1 WNV)

West Nile in Cape Girardeau County

From 1999 to 2025, CDC ArboNET counted 2 human West Nile cases in Cape Girardeau County (0 neuroinvasive) across 2 years. The worst was 2016 with 1; the latest was 2016.

See how the dates are worked out, and when mosquitoes go away for the winter.